In situ synthesis of graphene with telecommunication lasers for nonlinear optical devices

In situ synthesis of graphene with telecommunication lasers for nonlinear optical devices
풀락박재현Austin M. Scott이준수이주한송용원
in situ synthesis; graphene; fiber laser; optical nonlinearity; pulsed laser
Issue Date
Advanced Optical Materials
VOL 3, NO 9, 1264-1272
Despite auspicious optical properties of graphene, particularly its ability to absorb light over a broad wavelength range, incorporating presynthesized graphene in optical system by recognized transfer methods has critical drawbacks of introducing impurities and damaging the graphene fi lm which can affect the performance of optical system. Here a transfer-free, in situ synthesis of multilayered graphene is demonstrated directly onto single-mode optical fi ber end facet and polished surface of D-shaped fi ber by interfacial growth process in ambient condition. Conventional telecommunication lasers operating at ≈1550 nm band are employed to provide the activation energy for carbon atoms to diffuse, precipitate through Ni-catalyst layer, and form the graphene crystals at the interface of metal catalyst and optical fi ber. The in situ grown graphene on optical fi ber acts as saturable absorber in the fi ber laser ring cavity to generate ultrafast optical pulses by mode-locking technique. The formation and the quality of the resulting multilayered graphene are confi rmed by precision analysis tools. The synthesized graphene has the sp 2 -bond shares of 75.8% and it shows nonlinear optical absorption property with the modulation depth of 7%, guaranteeing passive mode-locking of fi ber laser operating in femtosecond scale.
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